History · Geology
About Wessels Mine
The Wessels mine in the Kalahari Manganese Field, South Africa, is the world’s premier producer of gem-grade purple sugilite, plus extraordinary Mn-rich species: blood-red rhodochrosite, gaudefroyite, manganite, inesite (secondary occurrence after Yaogangxian).
Geology
The Kalahari Mn field hosts vast Paleoproterozoic Mn-Fe sedimentary-metamorphic deposits. Wessels itself produced gel-form sugilite during late metamorphic-hydrothermal fluid migration through Mn-rich host rocks.
Notable Minerals
Sugilite (lilac-purple massive nodular — world’s only commercial source), rhodochrosite (gem-clear red rhombs), hausmannite (jet-black tabular), manganite, gaudefroyite (black hexagonal prisms), inesite (pink fans, smaller than Yaogangxian), barite, calcite.
Collector Notes
Wessels sugilite is the gem trade benchmark. The mine’s rhodochrosite is the second-rank collector source after Sweet Home (Colorado). Pair with Yaogangxian (Hunan) for the world inesite display.
